SOLUTION: A radioactive isotope has a half-life of 14 hours. Find the amount of the isotope left from a 320-milligram sample after 42 hours. If necessary, round your answer to the nearest th
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Question 893940: A radioactive isotope has a half-life of 14 hours. Find the amount of the isotope left from a 320-milligram sample after 42 hours. If necessary, round your answer to the nearest thousandth.
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
A radioactive isotope has a half-life of 14 hours. Find the amount of the isotope left from a 320-milligram sample after 42 hours. If necessary, round your answer to the nearest thousandth.
42 = 3*14, 3 half-lives
--> 320*(1/2)*(1/2)*(1/2)
= 40 mg
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